Type about:addons<enter> in the address bar to open the Add-ons Manager. Hot key; <Control> (Mac=<Command>) <Shift> A)

On the left side of the page, select Plugins. Find Shockwave Flash, and press the Options button. Uncheck Enable Adobe Flash Protected Mode.

https://support.mozilla.org/en-US/kb/adobe-flash-plugin-has-crashed#w_disable-flash-protected-mode Disable Flash protected mode

https://support.mozilla.org/en-US/kb/adobe-flash-plugin-has-crashed#w_disable-hardware-acceleration-in-flash Disable hardware acceleration in Flash

This still did not solve it. Thanks for the tip. Any other ideas?

Adobe Support https://forums.adobe.com/community/flashplayer

http://helpx.adobe.com/shockwave/kb/troubleshoot-shockwave-player-installation-windows.html Troubleshoot Shockwave Player installation | Windows http://helpx.adobe.com/shockwave/kb/troubleshoot-shockwave-player-installation-mac.html Troubleshoot Shockwave Player installation | Mac OS

https://support.mozilla.org/en-US/kb/adobe-flash-plugin-has-crashed

https://support.mozilla.org/en-US/kb/troubleshoot-issues-with-plugins-fix-problems

These sites basically say to uninstall and reinstall if you have a problem. That doesn't help me much. A reinstall gives me the same problem.